Git and Jenkins on the same server: bare or non-bare repo for autonated testing?

I have an AngularJS project with a bare Git repository on a private server, and I will introduce automated unit testing really soon. I want to install Jenkins on the same server, so I'm asking myself whether it's a good idea to use a non-bare repository so Jenkins could run the tests directly from there, or if I should make Jenkins to pull the code every time. On a side note, if the non-bare repo is the best solution, is there a way to transform the repo from bare to non-bare? Thanks